Dear user：

　　Thank you for choosing our company's products!

　　Before use, please read the user manual carefully and master the installation and usage methods of this product correctly. If you have any questions or opinions, please contact the unit installation unit or our company. We will provide you with satisfactory and thoughtful service.

　　The fresh air system you purchased has a 1-3 year warranty policy from the date of purchase; Free service during the warranty period, and appropriate material fees will be charged after the warranty period. The crew provides lifelong maintenance services.

　　If a malfunction occurs, please inform the company of the fault situation and warranty card number, and we will assign a technical engineer to maintain it.

　　The following situations are not covered by the warranty：

1. Malfunctions caused by natural disasters; For example, caused by floods, earthquakes, typhoons, and lightning.

2. Malfunctions caused by improper maintenance; For example, the filter was not cleaned or replaced in a timely manner, and the power supply was lacking.

3. Malfunctions caused by exceeding the scope of use; For example: exceeding the temperature range, power supply voltage too high or too low, working time too long, etc.

4. Malfunctions caused by self modification of circuit wiring or unauthorized modification of products;

5. Malfunctions caused by illegal installation.